##验证码
package com.gem.object; import java.util.Scanner; public class Text2 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String a = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";//62个 String str = ""; //放6个字符 for (int i = 0; i < 6; i++) { char s = a.charAt((int) (Math.random() * 62)); //随机生成字符(m-n)+m str += s; //字符累加 } System.out.println("随机生成的验证码为:" + str); System.out.println("请输入验证码"); if ((scanner.nextLine().trim()).equalsIgnoreCase(str)) { //键盘输入字符串,字符串比较函数 System.out.println("验证成功"); return; } else { System.out.println("验证失败"); return; } } }